diff --git a/include/wordclock_constants.h b/include/wordclock_constants.h
index 15cf7b4..b1b3b9a 100644
--- a/include/wordclock_constants.h
+++ b/include/wordclock_constants.h
@@ -69,6 +69,7 @@
 #define MATRIX_WIDTH (11)
 #define MATRIX_HEIGHT (11)
 #define NUM_MATRIX (MATRIX_WIDTH * (MATRIX_HEIGHT + 1))
+#define MIN_LEDS_PATTERN (0x0F)
 
 // NTP macros
 #define BUILD_YEAR (__DATE__ + 7)                   // Will expand to current year at compile time as string.